Grain number determination under contrasting radiation and nitrogen conditions in 2-row and 6-row barleys
Sebastián Arisnabarreta A B D and Daniel J. Miralles A C
+ Author Affiliations
- Author Affiliations
A Departamento de Producción Vegetal and IFEVA, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 (C1417DSE), Buenos Aires, Argentina.
B Current address: Trait and Field Solutions, Monsanto Company, RN 8 - Km 214 (2718), Fontezuela, Buenos Aires, Argentina.
C CONICET, Av. Rivadavia 1917 (C1033AAJ), Buenos Aires, Argentina.
D Corresponding author. Email: arisnaba@agro.uba.ar
Crop and Pasture Science 66(5) 456-465 https://doi.org/10.1071/CP14208
Submitted: 26 July 2014 Accepted: 9 January 2015 Published: 29 April 2015
Abstract
Crop growth and developmental rate around the pre-heading phase are important for determining grain yield potential in barley (Hordeum vulgare L.) and other crop cereals. The photothermal quotient, Q (ratio between photosynthetically active radiation (PAR) and temperature) around the flowering period has been found to be a good predictor of grain number per unit area under potential growing conditions when both solar radiation and temperature vary, but not under suboptimal nitrogen (N) conditions. Under suboptimal conditions, Q might not account for differences in grain number due to modifications in radiation-use efficiency (RUE), biomass partitioning between vegetative and reproductive organs, fruiting efficiency, and/or a combination of these factors. This paper aims at providing insights into how grain yield is defined during the pre-heading phase in 2- and 6-row barleys under contrasting N and radiation environments, using a model proposed by RA Fischer for grain number determination.
Nitrogen and radiation treatments affected grain number, and consequently grain yield, through changes in spike biomass at heading, and not by a direct N effect. When low and high N conditions were included, Q poorly explained variations in grain number. Nitrogen increased RUE during the pre-heading phase. When accumulated PAR intercepted between the maximum number of spikelet primordia and heading stages (PARia) was considered together with RUE, the accuracy of the model was increased. Nitrogen slightly increased biomass partitioning between reproductive and vegetative organs, but it was not strong enough to improve the model between PARia and grain number. In the case of fruiting efficiency, genotype × N and shading × N interactions highlighted that this trait was maximised when 6-rowed barleys and shading were imposed under the high N treatment.
Additional keywords: biomass partitioning, malting barley, nitrogen, pre-flowering period, radiation.
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